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Pinpointing a Refrigerant Leak in a Ductless Evaporator Coil

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Language: en

00:00:00.650
[Music]
00:00:10.190 00:00:10.200 we're doing a demonstration because
00:00:12.120 00:00:12.130 we're doing a leak detection on a
00:00:13.800 00:00:13.810 ductless evaporator coil that we just
00:00:15.930 00:00:15.940 got in we found a leak on it and I don't
00:00:19.290 00:00:19.300 find a lot of ductless of a particular
00:00:20.790 00:00:20.800 leak so I wanted to just verify the leak
00:00:22.890 00:00:22.900 location but I wanted to also show the H
00:00:26.340 00:00:26.350 10 G or the this is that we actually
00:00:28.200 00:00:28.210 have an old H 10 G here show its
00:00:30.269 00:00:30.279 performance again the new test early
00:00:32.970 00:00:32.980 detector that I just got and see what we
00:00:35.369 00:00:35.379 find out I chose this evaporator coil to
00:00:38.819 00:00:38.829 do this demonstration because it's a
00:00:40.649 00:00:40.659 ductless of a protocol that has a leak
00:00:42.149 00:00:42.159 in the fin pack that's how it was
00:00:43.469 00:00:43.479 diagnosed so we're going to go and do
00:00:45.329 00:00:45.339 the leak detection with a couple
00:00:46.259 00:00:46.269 different leak detectors pinpoint is
00:00:47.579 00:00:47.589 exactly where it is and then I'm
00:00:48.779 00:00:48.789 actually going to pull the fins away and
00:00:50.309 00:00:50.319 see if we can literally pinpoint the
00:00:52.319 00:00:52.329 location of this leak and see if we can
00:00:53.669 00:00:53.679 figure out what caused it
00:00:54.650 00:00:54.660 00:01:03.689 00:01:03.699 we're working with pet 410 a refrigerant
00:01:06.000 00:01:06.010 and we'll get right to it so here I got
00:01:09.870 00:01:09.880 my lease detector all hooked up I had
00:01:12.719 00:01:12.729 this warming up for about five minutes
00:01:14.700 00:01:14.710 here so we're good to go again this is
00:01:18.719 00:01:18.729 the H 10 G model and I have it on the
00:01:22.980 00:01:22.990 small setting you can see this was
00:01:25.170 00:01:25.180 floating up about an eighth of an inch
00:01:26.580 00:01:26.590 or so kind of bounce in there previously
00:01:31.560 00:01:31.570 this one wasn't floating that much and
00:01:34.139 00:01:34.149 it really needs to be doing that so I
00:01:37.980 00:01:37.990 went ahead and replaced the pump with
00:01:40.649 00:01:40.659 Brian and before we were getting about a
00:01:44.639 00:01:44.649 four to five second lag so we would so
00:01:47.910 00:01:47.920 say our leaks here we would pass the
00:01:50.070 00:01:50.080 leak and then it wouldn't indicate add a
00:01:53.580 00:01:53.590 leak till you know here or if you were
00:01:56.550 00:01:56.560 to pass the leak here and then you're
00:01:57.870 00:01:57.880 going to check down here and then it
00:02:00.930 00:02:00.940 would react to you know the leak that
00:02:04.260 00:02:04.270 was up here five seconds later just due
00:02:06.569 00:02:06.579 to the slow pumping and it's slowly
00:02:08.430 00:02:08.440 going down your hose now with the new
00:02:12.090 00:02:12.100 pump in it and the ball you know
00:02:15.530 00:02:15.540 hovering like it's supposed to
00:02:18.080 00:02:18.090 it picks the leak up way quicker I'm
00:02:21.449 00:02:21.459 just going to do a couple passes over it
00:02:23.009 00:02:23.019 we're going to see how easily it picks
00:02:24.660 00:02:24.670 it up and then Brian or is going to go
00:02:26.699 00:02:26.709 ahead and do it with the tesco and kind
00:02:29.190 00:02:29.200 of get an idea of comparison
00:02:44.770 00:02:44.780 so right here is where it's leaking make
00:02:49.489 00:02:49.499 a little indention there I'm trying to
00:02:51.530 00:02:51.540 do that
00:03:21.630 00:03:21.640 [Applause]
00:03:27.699 00:03:27.709 now I'm going to show you the test Oh
00:03:30.620 00:03:30.630 three 16-3 which is a seeded diode
00:03:33.350 00:03:33.360 sensor you see how quick one thing I do
00:03:36.170 00:03:36.180 like about is how quick it ones up yeah
00:03:38.660 00:03:38.670 as you leave this one wrong yeah the the
00:03:41.300 00:03:41.310 H in G you got it you got to let it run
00:03:42.860 00:03:42.870 a little longer and this is a pretty
00:03:44.360 00:03:44.370 small leak on this thing we're going to
00:03:46.340 00:03:46.350 figure out how much nitrogen is losing
00:03:48.440 00:03:48.450 right over our two hour period whatever
00:03:51.920 00:03:51.930 it may be but it's a fairly small leak
00:03:55.009 00:03:55.019 one thing about this particularly
00:03:56.780 00:03:56.790 detector is that if you block off the
00:03:58.940 00:03:58.950 end go ahead and block off the end and
00:04:00.290 00:04:00.300 show them go ahead do it again so you
00:04:04.070 00:04:04.080 definitely don't want to block off the
00:04:05.330 00:04:05.340 end because that will give you a false a
00:04:07.370 00:04:07.380 false positive but you can see where you
00:04:11.060 00:04:11.070 get right on there go back to it I mean
00:04:24.590 00:04:24.600 it's really really kind of tonight yeah
00:04:29.630 00:04:29.640 so I'll mark the leak so you can
00:04:30.860 00:04:30.870 actually see what is this or than this
00:04:32.330 00:04:32.340 somewhere in this general area this one
00:04:45.110 00:04:45.120 you know if you're traveling at your
00:04:46.580 00:04:46.590 normal speed you're going to be within
00:04:48.380 00:04:48.390 probably a two inch radius of the leak
00:04:51.590 00:04:51.600 right by the time that it hits and so
00:04:53.210 00:04:53.220 you can just keep kind of going back to
00:04:54.529 00:04:54.539 it and anybody who's actually done leak
00:04:56.180 00:04:56.190 detection knows it's a little lower than
00:05:00.980 00:05:00.990 that I mean this is a small wee Lotus
00:05:03.590 00:05:03.600 tube right here yeah this is amol it's
00:05:05.600 00:05:05.610 in this tube we're going to say it's
00:05:07.640 00:05:07.650 right about there
00:05:09.770 00:05:09.780 yeah that's about a half second one
00:05:12.470 00:05:12.480 second delay maybe yeah this one seems
00:05:14.780 00:05:14.790 to you know have an accuracy and in the
00:05:16.940 00:05:16.950 rated accuracies I mean like almost
00:05:19.490 00:05:19.500 identical between this and that but the
00:05:21.980 00:05:21.990 one advantage to this is handheld
00:05:23.270 00:05:23.280 battery operated and significantly less
00:05:25.130 00:05:25.140 expensive like at the price oh that's
00:05:27.500 00:05:27.510 awesome
00:05:28.010 00:05:28.020 we've got you know some corrosion
00:05:29.270 00:05:29.280 nothing nothing way out of the ordinary
00:05:31.340 00:05:31.350 but we're we're actually picking up the
00:05:33.140 00:05:33.150 leak consistently is in the pin pack so
00:05:36.290 00:05:36.300 we were consistently picking it up on
00:05:39.470 00:05:39.480 this third row of tubing right here just
00:05:44.120 00:05:44.130 right about there I need a little it a
00:05:47.300 00:05:47.310 little bend in the fins so you can find
00:05:56.950 00:05:56.960 00:06:05.470 00:06:05.480 00:06:21.490 00:06:21.500 00:06:25.600 00:06:25.610 there it is
00:06:34.440 00:06:34.450 00:06:41.320 00:06:41.330 there it is there's actually like a
00:06:44.779 00:06:44.789 little nick on the copper tubing it
00:06:48.709 00:06:48.719 doesn't really look like formal carry
00:06:50.299 00:06:50.309 corrosion that I'm used to seeing and
00:06:52.820 00:06:52.830 it's definitely right there right on top
00:06:56.139 00:06:56.149 probably kind of hard to you see there
00:06:58.189 00:06:58.199 but it's like like there's a little neck
00:07:02.859 00:07:02.869 it is a very small leak but we are
00:07:06.679 00:07:06.689 getting bubbles
00:07:18.740 00:07:18.750 so for those of you who feel like
00:07:23.010 00:07:23.020 electronic leak detector can't pinpoint
00:07:24.510 00:07:24.520 a leak this was first diagnosed in the
00:07:27.270 00:07:27.280 field and the pin pack and then we read
00:07:29.280 00:07:29.290 that we buy rejected here with both both
00:07:32.070 00:07:32.080 the tested leak detector and the HTM G
00:07:34.520 00:07:34.530 the performance of the two leak
00:07:36.570 00:07:36.580 detectors was very very similar and they
00:07:39.750 00:07:39.760 both pinpointed the league right at this
00:07:41.640 00:07:41.650 point in fact the test Oh lead sector
00:07:45.030 00:07:45.040 actually pinpointed it a little bit
00:07:48.180 00:07:48.190 quicker so it read just a touch quicker
00:07:49.800 00:07:49.810 because of the location of the sensor
00:07:51.890 00:07:51.900 but verified the exactly cloak ation
00:07:56.160 00:07:56.170 which is kind of what I'm going to
00:07:57.810 00:07:57.820 suggest that we do more often in the
00:07:59.610 00:07:59.620 field whenever possible this is actually
00:08:01.740 00:08:01.750 a leak that if you had to in a pinch get
00:08:04.560 00:08:04.570 by and patch it you could you could
00:08:06.360 00:08:06.370 patch it it's like there's a little
00:08:07.530 00:08:07.540 almost like a little rough spot on the
00:08:09.900 00:08:09.910 copper there obviously when once you dig
00:08:13.170 00:08:13.180 out the fins you've really ruined the
00:08:15.060 00:08:15.070 coil but in some applications where you
00:08:17.940 00:08:17.950 just need to get by and you've got a
00:08:19.950 00:08:19.960 copper coil with aluminum pins you can
00:08:21.870 00:08:21.880 patch it this way to get by so you can
00:08:24.120 00:08:24.130 get a get a proper coil so I'm Brian or
00:08:27.360 00:08:27.370 with HVAC school and HVAC our school
00:08:29.490 00:08:29.500 comm if you would be willing to
00:08:31.050 00:08:31.060 subscribe to the YouTube channel I would
00:08:32.430 00:08:32.440 sure appreciate it and also subscribe to
00:08:34.860 00:08:34.870 the podcast find a podcast app on your
00:08:36.900 00:08:36.910 phone and look for the word HVAC just
00:08:39.840 00:08:39.850 search HVAC look up our podcast and
00:08:42.240 00:08:42.250 subscribe to it I think you'll enjoy it
00:08:43.650 00:08:43.660 thanks for being here
00:08:45.060 00:08:45.070 see you next time on HVAC school
00:08:47.060 00:08:47.070 00:08:53.410 00:08:53.420 you

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